difference between Frame mode and 1/30 shutter?
I just shot some stuff in a dark club and slowed the shutter speed down a bit to 1/30. Loaded it into the computer and noticed that it's not interlaced. I shot with a setup that was in normal and not frame mode. do the CCD's act the same in both of these modes? besides more light hitting the CCD's, it also kind of resembles the look of frame mode on some of the edges, but not quite as bad. when I go back to normal shutter speed, the interlacing lines are there. Oh, using a DVC30.
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ok
I've done some more testing to see if there is any visual difference between these two. Initially I thought there would be a different in resolution thinking that 1/30 would be shooting at full resolution. I hooked up my DVC30 to a monitor and switched between frame mode and normal mode at 1/30 shutter speed. other than the light difference, the image quality looks exactly the same. on a 45 degree sharp line, you see the same stair step junk.
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"Stair stepping" is a by-product of the DV format. It's especially noticeable on 45-degree lines.
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But I don't see it in 60i and 60 shutter speed. only in frame mode or 1/30 shutter speed.
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doesn't shooting in 1/30 reduce your res by half? i don't think the camera is able to charge both fields on the CCD for 1/30th as that would take 2 seconds, as the CCD cannot capture the whole frame at once (because the CCD is interlaced) hence slow shutter speeds on interlaced CCD's capture half the res but with no interlace artifacts.
that's my understanding of it |
Michael,
Yes, you will lose vertical resolution in both modes. In Slow Shutter 1/30, the shutter speed in 1/30 (obviously. In Frame Mode, by default, the shutter speed will be the default 1/60. In light of that, Frame Mode should need a wider iris and/or more gain to get the same exposure. Josh |
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This is probably not a very reliable test, but I tend to shoot in the 60fps frame mode when I have enough light because I don't have to de-interlace in post and it looks better to my eyes, esp. while editing. I do remember reading a thread here a while ago on editing in FCP with progressive footage. It seems there is some setting especially for editing progressive footage in the timeline so that slow motion effects, freeze frame, etc. are rendered better using both 'fields' of the progressive frame. I could not find this setting, so perhaps someone who knows could chime in? Thanks. |
Well you wouldn't need to select de-interlace in quicktime if you were shooting in frame mode. It's progressive at that point. The resolution shot has already been taken. I mistakenly took what i read in another forum as truth when they said that shooting interlaced video, if you shoot at 1/30 shutter speed, the CCD's capture both fields at the same time. I like the feel of 30fps but not the look on the DVC30. I have a 16:9 HD LCD tv and the resolution degrade on the DVC30 at either frame mode or 1/30 shutter speed is pretty noticable. I guess i'm asking more from this camera than I paid for it. I guess I was hoping to shoot at 1/30 shutter and not take a vertical resolution hit, but now it's getting through my thick head that it's not possible with interlaced CCD's.
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